| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Parent star | ||
| Star | HD 102117 | |
| Constellation | Centaurus | |
| Right ascension | (α) | 11h 44m 50.4616s |
| Declination | (δ) | –58° 42′ 13.354″ |
| Distance | 137 ly (42 pc) |
|
| Spectral type | G6V | |
| Orbital elements | ||
| Semimajor axis | (a) | 0.1532 ±0.0088 AU |
| Periastron | (q) | 0.1347 AU |
| Apastron | (Q) | 0.1717 AU |
| Eccentricity | (e) | 0.106 ±0.07 |
| Orbital period | (P) | 20.8133 ±0.0064 d |
| Orbital speed | (υ) | 80.35 km/s |
| Argument of periastron |
(ω) | 283 ±3° |
| Time of periastron | (T0) | 10942.9 ±3 2.400.000 JD |
| Semi-amplitude | (K) | 11.8 ±0.77 m/s |
| Physical characteristics | ||
| Mass | (m) | >0.172 ±0.018 MJ (>54.7 M⊕) |
| Discovery information | ||
| Discovery date | September 16, 2004 | |
| Discoverer(s) | Tinney et al. | |
| Detection method | Radial Velocity | |
| Discovery site | Anglo-Australian Observatory, Australia | |
| Discovery status | Published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
HD 102117 b is a planet that orbits the star HD 102117. The planet is a small gas giant a fifth the size of Jupiter. It orbits very close to its star, but not in a "torch orbit" like the famous 51 Pegasi b. It is one of the smallest extrasolar planets discovered so far.[1]
In 2004, the Anglo-Australian Planet Search announced a planet orbiting the star HD 102117.[2] A short time later the HARPS team also announced the presence of a planet around this same star HD 102117. Both groups detected this planet using the radial velocity method.[3]